To change the settings of their Box o' Fun, the owner can interact twice with the box to receive an adjuster, which looks like a big metal rod and has a single skill. Hitting any box of fun with the metal rod will give you the following dialogue:

"The randomizer can be adjusted to a number of settings. Choose a setting."

The Gem Store description is as follows: "Spawn a box full of random fun for everyone in the area. Any allies can interact with the box every 15 seconds to get a fun effect. Color changing, shape shifting, and other fun tricks can be yours! Each box will remain in the world for five minutes."

This description has errors; allies can interact with the box every 10 seconds and the box remains in the world for 10 minutes.